From rc10b4
Itīs for the use with the optional inline axles. As these axles are further to the front, in line with the kingpin, hence the name, the thick black spacer is then to be put in front of the caster block to retain the same wheelbase. Itīs similar to what is explained in picture 5 on page 3 in the manual, as the ball ends have also to be moved in case of use of inline axles.
So always make sure the spacers are behind the caster blocks with the standard trailing axles, otherwise the whole steering geometry would be "bent".
The inline axles change the steering character, steering will be much more direct. The kitīs trailing axles are used almost all the time.
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